<!DOCTYPE html SYSTEM "http://www.thymeleaf.org/dtd/xhtml1-strict-thymeleaf-spring4-4.dtd">
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h2 th:text="${showtext}"></h2>
    <h2 th:utext="${showtext}"></h2>

    <span th:if="${19>20}">
        为假
    </span>
    <span th:unless="${19<20}">
        为真
    </span>
    <a href="hello" img src="image/3.jpg></a>
    <img th:src="@{image/2.jpg}">

</body>
</html>